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Employee Benefit Plans - Defined Contribution Retirement Plans (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
The DC Plan |  |  |
Defined Contribution Retirement Plans |  |  |
Maximum voluntary contribution by eligible U.S. employees as a percentage of their compensation | 50.00% |  |
Number of shares contributed | 279 | 334 | 605
Compensation expense | $ 9.4 | $ 8.7 | $ 8.8
Supplemental Retirement Savings Plan (SRSP) |  |  |
Defined Contribution Retirement Plans |  |  |
Compensation expense | 0.3 | 0.2 | $ 0.7
Supplemental Retirement Savings Plan (SRSP) | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Contribution Retirement Plans |  |  |
Fair value of assets | $ 18.4 | $ 21.2 |

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- Definition Defined Contribution Plan, Fair Value of Plan Assets + References No definition available. + Details
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- Definition Represents the number of shares contributed by the entity under the defined contribution plan. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Details
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